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COW Tutorials: After Effects Adding Light Stream and other Light Effects
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In this tutorial, CreativeCOW Contributing Editor Joe Chao finishes up his Genie in a lamp series by adding a light stream and a few other final lighting effects.Click on the link above to view Joe’s article. If you haven’t done part 1 and 2, be sure and click on the Tutorials link and find them first.
Kathlyn Lindeboom
Creativecow.net -
1 Reply
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First, thanks for the tutorial. Much appreciated. Very cool technique with the light path.
Second, the purpose of this post is to address an issue I’ve encountered while working through the process. After setting the expression for the particle emitter, I wasn’t seeing the position of the particle emitter change in response to changes made to the position of the motion path layer. My fix follows.
For “Position XY” expression:
temp = thisComp.layer("Null 1").position.valueAtTime(time);
[temp[0], temp[1]]For “Position Z” expression:
temp = thisComp.layer("Null 1").position.valueAtTime(time);
temp[2]The key change to note is that the valueAtTime(0) parameter has changed to valueAtTime(time) in order to keep the emitter position in parity with the motion path.
Additionally, I found no problem with simply using a Null as my position reference rather than the light as indicated in the tutorial. You’ll notice this change reflected in my modification of the code: layer(“Null 1”) (mine) vs. layer(“Motion Path 1”) (original).
Hope this is of use!
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Caltd
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